Can anyone recommend a good book for a 13 y/o English learner?

One of my pen pals who is 13 is learning English. He is from France. I’m open to buying grammar books or fun ones for leisure. Thankd for your help.

submitted by /u/verdigris1
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from Тавтай морилогтун | Languagelearning http://bit.ly/2Aq10qb
via Learn Online English Speaking